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-rw-r--r--src/target/arm_dpm.h14
-rw-r--r--src/target/armv7a.h10
-rw-r--r--src/target/cortex_a8.c52
3 files changed, 43 insertions, 33 deletions
diff --git a/src/target/arm_dpm.h b/src/target/arm_dpm.h
index c284144a..1f32e8bc 100644
--- a/src/target/arm_dpm.h
+++ b/src/target/arm_dpm.h
@@ -136,4 +136,18 @@ int arm_dpm_write_dirty_registers(struct arm_dpm *, bool bpwp);
void arm_dpm_report_wfar(struct arm_dpm *, uint32_t wfar);
+/* Subset of DSCR bits; see ARMv7a arch spec section C10.3.1.
+ * Not all v7 bits are valid in v6.
+ */
+#define DSCR_CORE_HALTED (1 << 0)
+#define DSCR_CORE_RESTARTED (1 << 1)
+#define DSCR_ITR_EN (1 << 13)
+#define DSCR_HALT_DBG_MODE (1 << 14)
+#define DSCR_MON_DBG_MODE (1 << 15)
+#define DSCR_INSTR_COMP (1 << 24)
+#define DSCR_DTR_TX_FULL (1 << 29)
+#define DSCR_DTR_RX_FULL (1 << 30)
+
+#define DSCR_ENTRY(dscr) (((dscr) >> 2) & 0xf)
+
#endif /* __ARM_DPM_H */
diff --git a/src/target/armv7a.h b/src/target/armv7a.h
index 0d5da86f..f089c5c5 100644
--- a/src/target/armv7a.h
+++ b/src/target/armv7a.h
@@ -114,16 +114,6 @@ target_to_armv7a(struct target *target)
/* See ARMv7a arch spec section C10.8 */
#define CPUDBG_AUTHSTATUS 0xFB8
-/* DSCR bit numbers (See ARMv7a arch spec section 12.4.5) */
-#define DSCR_CORE_HALTED 0
-#define DSCR_CORE_RESTARTED 1
-#define DSCR_EXT_INT_EN 13
-#define DSCR_HALT_DBG_MODE 14
-#define DSCR_MON_DBG_MODE 15
-#define DSCR_INSTR_COMP 24
-#define DSCR_DTR_TX_FULL 29
-#define DSCR_DTR_RX_FULL 30
-
struct armv7a_algorithm
{
int common_magic;
diff --git a/src/target/cortex_a8.c b/src/target/cortex_a8.c
index 9ca072e0..14cbb9d7 100644
--- a/src/target/cortex_a8.c
+++ b/src/target/cortex_a8.c
@@ -91,8 +91,8 @@ static int cortex_a8_init_debug_access(struct target *target)
/* To reduce needless round-trips, pass in a pointer to the current
* DSCR value. Initialize it to zero if you just need to know the
- * value on return from this function; or (1 << DSCR_INSTR_COMP) if
- * you happen to know that no instruction is pending.
+ * value on return from this function; or DSCR_INSTR_COMP if you
+ * happen to know that no instruction is pending.
*/
static int cortex_a8_exec_opcode(struct target *target,
uint32_t opcode, uint32_t *dscr_p)
@@ -107,7 +107,7 @@ static int cortex_a8_exec_opcode(struct target *target,
LOG_DEBUG("exec opcode 0x%08" PRIx32, opcode);
/* Wait for InstrCompl bit to be set */
- while ((dscr & (1 << DSCR_INSTR_COMP)) == 0)
+ while ((dscr & DSCR_INSTR_COMP) == 0)
{
retval = mem_ap_read_atomic_u32(swjdp,
armv7a->debug_base + CPUDBG_DSCR, &dscr);
@@ -130,7 +130,7 @@ static int cortex_a8_exec_opcode(struct target *target,
return retval;
}
}
- while ((dscr & (1 << DSCR_INSTR_COMP)) == 0); /* Wait for InstrCompl bit to be set */
+ while ((dscr & DSCR_INSTR_COMP) == 0); /* Wait for InstrCompl bit to be set */
if (dscr_p)
*dscr_p = dscr;
@@ -198,7 +198,7 @@ static int cortex_a8_dap_read_coreregister_u32(struct target *target,
}
/* Wait for DTRRXfull then read DTRRTX */
- while ((dscr & (1 << DSCR_DTR_TX_FULL)) == 0)
+ while ((dscr & DSCR_DTR_TX_FULL) == 0)
{
retval = mem_ap_read_atomic_u32(swjdp,
armv7a->debug_base + CPUDBG_DSCR, &dscr);
@@ -225,7 +225,7 @@ static int cortex_a8_dap_write_coreregister_u32(struct target *target,
/* Check that DCCRX is not full */
retval = mem_ap_read_atomic_u32(swjdp,
armv7a->debug_base + CPUDBG_DSCR, &dscr);
- if (dscr & (1 << DSCR_DTR_RX_FULL))
+ if (dscr & DSCR_DTR_RX_FULL)
{
LOG_ERROR("DSCR_DTR_RX_FULL, dscr 0x%08" PRIx32, dscr);
/* Clear DCCRX with MCR(p14, 0, Rd, c0, c5, 0), opcode 0xEE000E15 */
@@ -315,14 +315,14 @@ static int cortex_a8_read_dcc(struct cortex_a8_common *a8, uint32_t *data,
uint32_t *dscr_p)
{
struct swjdp_common *swjdp = &a8->armv7a_common.swjdp_info;
- uint32_t dscr = 1 << DSCR_INSTR_COMP;
+ uint32_t dscr = DSCR_INSTR_COMP;
int retval;
if (dscr_p)
dscr = *dscr_p;
/* Wait for DTRRXfull */
- while ((dscr & (1 << DSCR_DTR_TX_FULL)) == 0) {
+ while ((dscr & DSCR_DTR_TX_FULL) == 0) {
retval = mem_ap_read_atomic_u32(swjdp,
a8->armv7a_common.debug_base + CPUDBG_DSCR,
&dscr);
@@ -350,10 +350,10 @@ static int cortex_a8_dpm_prepare(struct arm_dpm *dpm)
retval = mem_ap_read_atomic_u32(swjdp,
a8->armv7a_common.debug_base + CPUDBG_DSCR,
&dscr);
- } while ((dscr & (1 << DSCR_INSTR_COMP)) == 0);
+ } while ((dscr & DSCR_INSTR_COMP) == 0);
/* this "should never happen" ... */
- if (dscr & (1 << DSCR_DTR_RX_FULL)) {
+ if (dscr & DSCR_DTR_RX_FULL) {
LOG_ERROR("DSCR_DTR_RX_FULL, dscr 0x%08" PRIx32, dscr);
/* Clear DCCRX */
retval = cortex_a8_exec_opcode(
@@ -376,7 +376,7 @@ static int cortex_a8_instr_write_data_dcc(struct arm_dpm *dpm,
{
struct cortex_a8_common *a8 = dpm_to_a8(dpm);
int retval;
- uint32_t dscr = 1 << DSCR_INSTR_COMP;
+ uint32_t dscr = DSCR_INSTR_COMP;
retval = cortex_a8_write_dcc(a8, data);
@@ -390,7 +390,7 @@ static int cortex_a8_instr_write_data_r0(struct arm_dpm *dpm,
uint32_t opcode, uint32_t data)
{
struct cortex_a8_common *a8 = dpm_to_a8(dpm);
- uint32_t dscr = 1 << DSCR_INSTR_COMP;
+ uint32_t dscr = DSCR_INSTR_COMP;
int retval;
retval = cortex_a8_write_dcc(a8, data);
@@ -413,7 +413,7 @@ static int cortex_a8_instr_write_data_r0(struct arm_dpm *dpm,
static int cortex_a8_instr_cpsr_sync(struct arm_dpm *dpm)
{
struct target *target = dpm->arm->target;
- uint32_t dscr = 1 << DSCR_INSTR_COMP;
+ uint32_t dscr = DSCR_INSTR_COMP;
/* "Prefetch flush" after modifying execution status in CPSR */
return cortex_a8_exec_opcode(target,
@@ -426,7 +426,7 @@ static int cortex_a8_instr_read_data_dcc(struct arm_dpm *dpm,
{
struct cortex_a8_common *a8 = dpm_to_a8(dpm);
int retval;
- uint32_t dscr = 1 << DSCR_INSTR_COMP;
+ uint32_t dscr = DSCR_INSTR_COMP;
/* the opcode, writing data to DCC */
retval = cortex_a8_exec_opcode(
@@ -442,7 +442,7 @@ static int cortex_a8_instr_read_data_r0(struct arm_dpm *dpm,
uint32_t opcode, uint32_t *data)
{
struct cortex_a8_common *a8 = dpm_to_a8(dpm);
- uint32_t dscr = 1 << DSCR_INSTR_COMP;
+ uint32_t dscr = DSCR_INSTR_COMP;
int retval;
/* the opcode, writing data to R0 */
@@ -639,7 +639,7 @@ static int cortex_a8_halt(struct target *target)
*/
mem_ap_read_atomic_u32(swjdp, armv7a->debug_base + CPUDBG_DSCR, &dscr);
retval = mem_ap_write_atomic_u32(swjdp,
- armv7a->debug_base + CPUDBG_DSCR, dscr | (1 << DSCR_HALT_DBG_MODE));
+ armv7a->debug_base + CPUDBG_DSCR, dscr | DSCR_HALT_DBG_MODE);
if (retval != ERROR_OK)
goto out;
@@ -647,7 +647,7 @@ static int cortex_a8_halt(struct target *target)
do {
mem_ap_read_atomic_u32(swjdp,
armv7a->debug_base + CPUDBG_DSCR, &dscr);
- } while ((dscr & (1 << DSCR_CORE_HALTED)) == 0);
+ } while ((dscr & DSCR_CORE_HALTED) == 0);
target->debug_reason = DBG_REASON_DBGRQ;
@@ -742,13 +742,18 @@ static int cortex_a8_resume(struct target *target, int current,
}
#endif
- /* Restart core and wait for it to be started */
+ /* Restart core and wait for it to be started
+ * NOTE: this clears DSCR_ITR_EN and other bits.
+ *
+ * REVISIT: for single stepping, we probably want to
+ * disable IRQs by default, with optional override...
+ */
mem_ap_write_atomic_u32(swjdp, armv7a->debug_base + CPUDBG_DRCR, 0x2);
do {
mem_ap_read_atomic_u32(swjdp,
armv7a->debug_base + CPUDBG_DSCR, &dscr);
- } while ((dscr & (1 << DSCR_CORE_RESTARTED)) == 0);
+ } while ((dscr & DSCR_CORE_RESTARTED) == 0);
target->debug_reason = DBG_REASON_NOTHALTED;
target->state = TARGET_RUNNING;
@@ -788,7 +793,6 @@ static int cortex_a8_debug_entry(struct target *target)
LOG_DEBUG("dscr = 0x%08" PRIx32, cortex_a8->cpudbg_dscr);
- /* Enable the ITR execution once we are in debug mode */
mem_ap_read_atomic_u32(swjdp,
armv7a->debug_base + CPUDBG_DSCR, &dscr);
@@ -797,12 +801,13 @@ static int cortex_a8_debug_entry(struct target *target)
* Synchronization Barrier: ARMV4_5_MCR(15, 0, 0, 7, 10, 4).
*/
- dscr |= (1 << DSCR_EXT_INT_EN);
+ /* Enable the ITR execution once we are in debug mode */
+ dscr |= DSCR_ITR_EN;
retval = mem_ap_write_atomic_u32(swjdp,
armv7a->debug_base + CPUDBG_DSCR, dscr);
/* Examine debug reason */
- switch ((cortex_a8->cpudbg_dscr >> 2)&0xF)
+ switch (DSCR_ENTRY(cortex_a8->cpudbg_dscr))
{
case 0: /* DRCR[0] write */
case 4: /* EDBGRQ */
@@ -1005,7 +1010,8 @@ static int cortex_a8_step(struct target *target, int current, uint32_t address,
}
cortex_a8_unset_breakpoint(target, &stepbreakpoint);
- if (timeout > 0) target->debug_reason = DBG_REASON_BREAKPOINT;
+ if (timeout > 0)
+ target->debug_reason = DBG_REASON_BREAKPOINT;
if (breakpoint)
cortex_a8_set_breakpoint(target, breakpoint, 0);
generated by cgit v1.2.3 (git 2.46.0) at 2024-12-23 17:35:27 +0000